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-rw-r--r--conn/mark_unix.go1
1 files changed, 1 insertions, 0 deletions
diff --git a/conn/mark_unix.go b/conn/mark_unix.go
index 18eb581..faa4245 100644
--- a/conn/mark_unix.go
+++ b/conn/mark_unix.go
@@ -1,3 +1,4 @@
+//go:build linux || openbsd || freebsd
// +build linux openbsd freebsd
/* SPDX-License-Identifier: MIT